28034140 has 24 divisors (see below), whose sum is σ = 59753232. Its totient is φ = 11045760.

The previous prime is 28034129. The next prime is 28034143. The reversal of 28034140 is 4143082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28034143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9121 + ... + 11800.

It is an arithmetic number, because the mean of its divisors is an integer number (2489718).

Almost surely, 2^28034140 is an apocalyptic number.

28034140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28034140 is an abundant number, since it is smaller than the sum of its proper divisors (31719092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28034140 is a wasteful number, since it uses less digits than its factorization.

28034140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20997 (or 20995 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 28034140 is about 5294.7275661737. The cubic root of 28034140 is about 303.7822627137.

The spelling of 28034140 in words is "twenty-eight million, thirty-four thousand, one hundred forty".